Iris-diaphragm.



R. KLEIN 11 T. BRUECK.

IRIS DIAPHRAGM.

APPLICATION FILED DEC.H,1914.

1,153,819, 7 P11811161 Sept. 14, 1915.

40 both internally and externally threaded,.the

UNITED. STATES PATENT OFFICE.

, RUDOLPH KLEIN AND 'rnnonon imunox, or noonns'rnn, NEW YORK.

IBIS-DIAYHRAGM.

Patented Sept. 14, 1915.

Application filed December 11, 1914. Serial No. 876,651.

To all whom it may concern:

Be it known that we, RUDOLPH KLEIN and THEoooR BRUnoK, of Rochester, inthe county of Monroe and State of New York, have invented a new anduseful Improvement in Iris-Diaphragms, which improvement is fully setforth in the following specification and shown in the accompanyingdrawings.

The present invention relates to iris diaphragms designed for use onphotographic shutters, microscopes, lens barrels and other opticalinstruments and an object of the invention is to provide a constructionwhich is inexpensive to manufacture both because of the employment of afewer number of parts and because of the simplicity by which the partsmay be assembled.

To this and other ends, the invention consists in certain parts andcombinations of parts all of which will be hereinafter de scribed, thenovel features being pointed out in the appended claims. I

In the drawings: Figure 1 is a view of the iris diaphragm constructedfor use with a photographic shutter, the blades being illustrated asopen; Fig. 2 is a view similar to Fig. 1 with the covering plateremoved; Fig. 3 is a view similar to Fig. 2 showing the blades in closedp'ositions; Fig. 4 is a view with the iris plate and all of the bladesexcept one removed; Fig.1.) is an enlarged sectional view, on the linearea, Fig. 4, showing the manner of securing oneflend of each blade; andFig. 6 is a central enlarged section through the device.'

Referring more particularly to the drawings, 1 indicates the support orcasing of the device which is in this instance of annular form having anannular flange 2 projecting from the inner periphery, this flange beingas covers for the unsightlyparts of the de-' vice. The support or casingis also provided with a seat 5 and an annular bearin 5 to one side ofthe seat 3 and on this hearing and seat the indicator ring 6 may turn.The indicator ring, in this instance, is provided with an arm 7 workmgthrough a curved slot in the support or casing 1 and having a pointer 9at one end for traveling over a scale as is common in devices of thiskind. This ring may have a central ofl'set annular portion 10 pressedlaterally to one side of .the plane of the outer or bearing portion 6 ofsaid ring, thus forming an annular shoulder 11 between the bearingportion 6 and the central portionlO. The portion 10 serves, in thisinstance, for pivotally ,connecting with the blades or leaves 12 which,may be each in the form of a segment of an annulus. At one end, eachblade is formed with a pintle and this pintle is of such a constructionthat it interlocks with one of the bearings 13, the latter being formedby making an annular series of openings in the indicatorring portion 10.In this instance, this pintle comprises a tongue projecting from one endof the blade 12 and bent at an oblique angle at 1 1 and thence parallelwith the blade at 15, the oblique portion being extended through one 'ofthe openings 13 so that its side edges form a bearing, and theparallelportion 15 being adapted to cooper ate with the face of theindicator ring opposite that on which the blade operates. With thisinterlocking connection between one end ofthe blade and the indicatorring, it is possible to readily introduce the pintle into the opening 13of the indicator ring by a tilting movement'of the blade, and, after theblade is moved so as to lie substantially parallel with the indicatorring, there is no' tendency for the blade to become detachedaccidentally from the indicator ring.

The assembling of the blades of an iris diaphragm has been one of themost trouble-.-

some operations in the manufacture of these articles as it has beenfound that where the blade does not interlock with one of the parts ofthe shutter, it, in a great many cases, becomes detached while otherblades .are being fitted in place, a slight wind effecting theirderangement. This disadvantage is overcome by the-present improvementbecause the blades carry pintles formed withv lateral portions whichcooperate with that face of the indicator ring opposite that on whichthe blades operate. Itis apparent, however, that the invention is notlimited to arranging this pintle on either end of the blade it beingmerely necessary to provide an .interlocking connection which will holdone end of each blade against accidental displacement during theassembling of the other blades.

Shifting fulcrums are provided for the other ends of the blades on theiris ring or plate 18 which is supported on a seat 19 in spaced relationto the bearing portion 6 of theaindicator ring. Within this space liethe laterally extending lips 16 of the blades, said lips bemg slotted at17 to receive pintles on the iris ring or late 18 The manner of formingthese pint es and also the location of the same is novel. These pintlesare formed by providing radial projections preferably on the innerperiphery of the annular blank from which the iris .plate orring 18' ismade. These projections are'bent laterally with reference to the irisring 18 to provide the pintles 20 The pintles lie within the annularshoulder 11 in close proximity to the latter and in this way retain theslotted ends of the blades within the space between the indicator ringand the iris ring 18. As the pintles 20 are near the inner peripher ofthe iris ring it is possible for the assem ler,

when putting the iris ring in place, to prop-' erly and easily positionthe slotted ends of the bladesso that the pintles may be easily passedinto the slots. f desired, a covering plate 21 may be fitted over the\iris plate, and the casing or support for the iris diaphragm ma serve asa cover or cap for a photographic shutter.

7 According to this invention, the blades are assembled in the device byinterlocking one end of each to the ring which, according to theconstruction is most advantageously situated for this purpose. In thisinstance, this ring is the indicator ring. I After all the blades havebeen interlocked with the indicator ring, the iris ring is placed overthem, the position of the pintles at the inner periphery of the irisring making'it possible to see clearly Whether the pintles are enteringthe slots in the blades, and also to see the blades to manipulate them.

What we claim as our invention and desire to secure b Letters Patent is:

1. An irisdiaph'ragm comprisin -aniris ring, a rotary indicator ring, anblades, one end of each blade having a shifting fulcrum on one of saidparts, and the other end of the blade having a pivotal interlockingconnection with the other of said arts to prevent accidentaldisplacement oft e blade durin assemblin Q 2. n iris dia iragmcomprising an iris ring, a'rotary'in icator ring, lades, a shiftablefulcrum connecting each blade with one of the first two named parts, anda pivotal connection between each blade and the, other of the first twonamed parts, the pivotal connection embodyin erally from one o the partswhich it connects, extending through'the other of said extends.

port, an indicator rin a pivot pro ecting lat-' connected parts andhaving a portion 00- operating with the opposite face of the part throuh which it extends.

3. iris diaphragm com rising an iris ring, a rotary indicator ring,lades, a shiftablc fulcrum between one end of each blade and one of thefirst two-named parts, and a pintle projectin laterally from ea'chbladeand extending t irough the other of the first two-named .parts, saidpintle having a lateral extension to cooperate with the o posite. faceof the part through which the pmtle 4. An iris diaphragm comprisin aniris ring, a rotary indicator ring provi ed with an annular series ofopenin s, blades, a shiftable fulcrum between each lade and the irisring, and a pintle extending from each blade through one of the openingsof the indicator ring and having a lateral extension at one end adaptedto cooperate with the oppo site face of the ring.

5. An iris diaphragm comprising a supon the support and hav1ng,anannular series of circular openings,.a plurality of blades; each havinga pintle at one end extending obliquely to the plane of the blade througmounted to rotate one of the openings of the indicator rin said pintlehaving an extension parallel wit the blade to engage the opposite faceof the indicator ring, an iris ring, and a shiftable fulcrum connectingeaeh blade with the iris rin l 3 6? An iris diaphragin comprising bladeseach having a slotted portion, an indicator rin to WhlOh said blades arepivoted, said indlcator ring having a bearin portion and a centralannular portion 0 set from the bearing portion to provide an annularshoulder, the blades being pivoted to the central annular portion, aniris ring spaced from the bearing portion of the indicator rin andhaving the slotted portions of the blades lying in said space, andpintles ,projecting from the iris ring through the slotted portions ofthe blades and within the annular shoulder of the indicator ring tooverhan suchshoulder and thus retain the bla es in the space between theindicator ring and the iris ring. I e

7. An iris diaphragm comprising blades each having a slotted portion, anindicator ring to which said blades are pivoted, and an iris ring havinglaterally extending pintlesarranged at the inner periphery of the ringvand .projecting through the slots of the blades.

8. Aniris diaphragm comprising blades each havin a slotted portion, anindicator ring to whlch-said-blades are pivoted, and

anlris rin formed from an annular blank having ra ially extendin ton esat one edge thereof bent lateral y an extendmg through the slot oftheblades.

being also pivotally connected to the other 7 g RUDOLPH KLEIN.

THEODOR BRUECK. Witnesses:

H. H. SIMMS, ADA M. WHITMORE.

